Date: Sat, 23 Feb 2008 02:20:40 +0100 From: "Danny Pansters" <danny@ricin.com> To: freebsd-multimedia@freebsd.org Subject: Re: Kbtv2 beta2 uploaded Message-ID: <200802230220.40947.danny@ricin.com> In-Reply-To: <200802230210.06590.danny@ricin.com> References: <200802230046.AAA06421@sopwith.solgatos.com> <200802230156.29551.danny@ricin.com> <200802230210.06590.danny@ricin.com>
index | next in thread | previous in thread | raw e-mail
Alright, one final comment: it's quite possible that USB (even USB2) is so slow that it kills everything. I don't rule out that possibility. Just to be complete, I'll quit now :) Dan On Saturday 23 February 2008 02:10:06 Danny Pansters wrote: > On Saturday 23 February 2008 01:56:29 Danny Pansters wrote: > > On Friday 22 February 2008 17:46:42 Dieter wrote: > > > > Your card seems to have a microtune tuner mt2050 which is not yet > > > > supported by the saa backend. I'm looking into it. Unfortunately it > > > > differs from the other generic tuner APIs for saa in that tuning and > > > > init are to be handled differently (mt2032 is supported by bktr, so I > > > > can peek there). THis is an important tuner to have support for > > > > though for several reasons: > > > > > > > > - it's on a chip, not in a large chunky metal enclosure > > > > > > I have read that the very small USB tuners don't perform as well as the > > > "large chunky metal enclosure", because some features were left out. > > > _______________________________________________ > > > freebsd-multimedia@freebsd.org mailing list > > > http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia > > > To unsubscribe, send any mail to > > > "freebsd-multimedia-unsubscribe@freebsd.org" > > > > Well, they don't have an mpeg encoder chip, but neither do the old > > fashioned analog TV cards. Of course, supporting that A/V decoder is > > another matter. But so is supporting an onboard mpeg encoder. > > Adding: > > And a ATSC or DVB-n dedicated chip that makes the output be a transport > stream. So in this case that is similar to the encoder step that you have > with, e.g. a PVR 150. It may be that those chips underperform, I don't > know. > > For analog though, it will probably work fine (the existing kbtv backends > use very little CPU if using accelerated HW, and there's not any remarkable > difference between the bktr and saa backend viewers that use the > conventional "mmap YUV pixels" and the cxm (PVR) backend which is just a > mpeg2 elementary stream player, 99% equal to ffplay. It creams mplayer > though ;-P > > Neither need much CPU on FreeBSD, even on non-accelarated platforms such as > amd64 I'd still guess (based on kbtv1 testing about a year ago), that under > KDE and normal usage WCPU for kbtv (1 or 2) will be ~20% and that's way > less than say, amarok. Or any TV app for windows vista I would venture to > guess. > > > They seem to use empia chipsets almost exclusively, the variant without > > onboard MPEG encoder is called the "blackbird" design IIRC. > > > > Dan > > Cheers, > > Dan > _______________________________________________ > freebsd-multimedia@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia > To unsubscribe, send any mail to > "freebsd-multimedia-unsubscribe@freebsd.org"help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200802230220.40947.danny>